Asymmetric Synthesis of β-Mercapto Carboxylic Acid Derivatives by Intramolecular Sulfur Transfer in <i>N</i>-Enoyl Oxazolidine-2-thiones Promoted by Lewis Acids
Oxazolidine-2-thiones and Thiazolidine-2-thiones as Nucleophiles in Intermolecular Michael Additions
作者:Laura Munive、Veronica M. Rivas、Aurelio Ortiz、Horacio F. Olivo
DOI:10.1021/ol301489y
日期:2012.7.6
Conjugate addition of thiazolidinethiones and oxazolidinethiones to N-crotonylthiazolidinethiones and -oxazolidinethiones was observed in the presence of excess triethylamine in dichloromethane. The addition takes place by the nitrogen of the heterocycle with high diastereoselectivity. It was observed that the stereoselective addition occurs on the anti-s-cis conformation of the N-enoyl sulfur-containing heterocycle.